Process for preparing a low-temperature cured formed thermal garment

Abstract

The application relates to a low-temperature curing forming process for preparing a thermal-keeping garment, and relates to the technical field of garment manufacturing. The process comprises the steps of fabric preheating, preparation of a thermal-keeping slurry, variable-density laying, stage-type temperature and humidity curing and piece splicing. A coating mechanism of a laying equipment is composed of a support, a bearing frame, a groove base, a first motor, a motion structure and a spraying structure. The motion structure adopts a three-pronged rod and a gear disc combined transmission, and cooperates with a runway-like groove to convert uniform rotary motion into variable-speed straight-line reciprocating motion, so that the nozzle group automatically slows down and turns back at both ends in the middle section of the stroke at a high speed. The spraying structure is provided with a double-worm angle adjusting device for respectively controlling the azimuth angle and the elevation angle of the nozzle. The application cooperates a mechanical variable-speed mechanism, an independently adjustable multi-nozzle array and a stage-type curing process to construct a thermal-keeping layer with an inclined interface non-homogeneous microlayer structure and an edge thickening feature, which has excellent flexibility and anti-peeling property, and the equipment structure is compact, the operation is reliable, and the yield is high.

Description

Technical Field

[0001] This application relates to the technical field of garment manufacturing, and in particular to a process for preparing thermal clothing by low-temperature curing molding. Background Technology

[0002] Clothing plays a vital role in keeping warm. The human body continuously radiates heat outwards via infrared rays, and suppressing heat loss in cold environments is a core research topic in clothing insulation materials. Traditional insulation methods often involve increasing the thickness of the filling to improve warmth, but this results in bulky products and performance degradation after washing. In recent years, the technical approach of constructing insulation layers by applying functional coatings has provided a new direction for the development of lightweight and thin thermal clothing.

[0003] In the prior art, Chinese invention patent CN113287817A discloses a thermal insulation lining and its preparation method. The thermal insulation lining includes a first thermal insulation layer disposed on a surface layer and a second thermal insulation layer disposed on the first thermal insulation layer. The first thermal insulation layer is selected from a metal foil layer, a polymer film layer, or a first heat-insulating coating. The first heat-insulating coating is formed from a first heat-insulating slurry, which includes 10-20 parts by weight of water, 1-5 parts by weight of a dispersant, 5-10 parts by weight of a functional material, and 20-30 parts by weight of a first adhesive. The material is selected from one or more of nano-metals, nano-metal oxides, infrared reflective pigments, and the first heat insulation material; the second heat insulation layer is formed by a second heat insulation slurry, which includes 5-10 parts by weight of water, 10-15 parts by weight of the second heat insulation material, 30-40 parts by weight of the second adhesive, and 0-3 parts by weight of an aqueous thickener. This application improves the heat insulation efficiency of the heat insulation lining by setting a double heat insulation layer, using the first heat insulation layer to reflect human body heat radiation and the second heat insulation layer to store still air, thereby achieving superposition of heat insulation from two heat transfer paths.

[0004] However, the existing technology uses full-width coating or regular pattern printing for the first and second insulation layers. The resulting insulation layer has a relatively uniform density distribution in the fabric plane, making it difficult to form a reinforcing structure at both ends of the fabric. In addition, the process involves multiple layers of paste being coated and dried and baked separately, which involves relatively many steps. The insulation layer formed by a single thick coating has the potential risk of interlayer peeling when subjected to repeated stress. Summary of the Invention

[0005] The purpose of this application is to provide a low-temperature curing molding process for manufacturing thermal clothing to solve the problems in the background art.

[0006] This application provides a low-temperature curing molding process for manufacturing thermal clothing, which adopts the following technical solution: including the following steps: S1. Fabric pretreatment: Fix the garment fabric pieces onto a movable forming mold and preheat the fabric pieces to a temperature of 30-45℃.

[0007] S2. Preparation of low-temperature curing thermal insulation slurry: Mix water-based polyurethane prepolymer, phase change microcapsules, hollow glass microspheres and crosslinking agent in a mass ratio of 100:15-30:10-20:3-8, and stir and degas under vacuum to obtain a thermal insulation slurry with a viscosity of 3000-8000 mPa·s.

[0008] S3. Variable density coating: The fabric piece is conveyed longitudinally at a constant speed, while a coating device performs multiple transverse reciprocating sprays on the surface of the moving fabric piece. The transverse length of the spray head group arranged in a straight line on the coating device is half the width of the fabric piece, and the spray head group has at least 3 spray heads arranged along its length. During the process of the spray head group completing one complete transverse reciprocating stroke at a variable speed, the spray strips formed by each spray head on the surface of the fabric piece overlap each other obliquely, and through multiple superpositions, a wet insulation layer with a thickness of 0.5-3mm is formed.

[0009] S4. Low-temperature curing molding: Place the fabric piece with the wet insulation layer in an environment of 45-70℃ and 50-80% relative humidity for 20-60 minutes to cure the water-based polyurethane prepolymer crosslinking and curing, and fix the phase change microcapsules and hollow glass microspheres to form a porous flexible insulation layer with a heterogeneous microlayer structure.

[0010] S5. Piece splicing: Multiple cured fabric pieces with thermal insulation layers are spliced ​​together according to the garment structure to obtain the thermal garment.

[0011] Preferably, the low-temperature curing molding in step S4 adopts a staged temperature and humidity control: the first stage is maintained at 45-55℃ and 70-80% relative humidity for 10-15 minutes; the second stage is maintained at 60-70℃ and 50-60% relative humidity for 10-45 minutes; through the two-stage temperature and humidity adjustment, a cross-linking density gradient is formed from the outer surface to the inner surface of the insulation layer, with the cross-linking density on the outer surface being higher than that on the inner surface; the higher humidity in the first stage is conducive to the full wetting of the water-based polyurethane prepolymer and keeping it in an open state, promoting the initial film formation; the second stage increases the temperature and decreases the humidity, accelerating the cross-linking curing reaction. At the same time, due to the early evaporation of surface moisture and the later escape of internal moisture, a cross-linking gradient is formed from the outside to the inside, which enhances the wear resistance of the outer surface of the insulation layer, while the inner surface maintains good flexibility and elasticity, taking into account both durability and wearing comfort.

[0012] Preferably, in step S3, the lateral movement of the nozzle assembly is a variable-speed reciprocating motion, which makes the nozzle assembly have a high speed in the middle of the stroke and a low speed at both ends of the stroke, thereby forming a thicker insulating band with a greater thickness than the middle area in the lateral end area of ​​the fabric piece; when the movement speed is low, the amount of paste deposited per unit area increases accordingly, so the paste accumulates thicker in the end areas, and after solidification, it forms an edge-reinforced insulating zone, which is used to provide additional warmth and mechanical strength at the splicing edge of the fabric piece.

[0013] Preferably, in step S3, when the nozzles of the nozzle group perform oblique overlapping spraying, the slurry strips sprayed by adjacent nozzles contact and flow and fuse before curing. After curing in step S4, a thermal insulation layer with an inclined interface heterogeneous micro-layer structure is formed. Since the fabric moves continuously in the longitudinal direction and the nozzle group makes transverse reciprocating motion, the actual trajectory of the sprayed slurry on the fabric is an inclined curve. After multiple reciprocating motions, the slurry layers deposited by different nozzles at different times overlap and the interfaces are at angles to each other. When the thermal insulation layer is subjected to bending stress, the cracks will continuously encounter the obstruction of the inclined interface and deflect during the propagation process, thereby dispersing the stress to a larger area and improving the bending fatigue resistance and peel resistance of the thermal insulation layer.

[0014] This application also provides a material spreading device for the above-mentioned process, including a crossbeam, with a first pad and a second pad respectively locked and fixed on the left and right sides of the bottom of the crossbeam, the first pad and the second pad being used to securely install the entire device on the production line frame; a linear module is longitudinally locked and fixed on the front side of the crossbeam, and a coating mechanism is locked and fixed on the front moving end of the linear module, the rear bottom side of the coating mechanism being connected to an external adhesive source end through a hose to receive a continuous supply of heat-insulating slurry.

[0015] Preferably, the coating mechanism includes a bracket that is fastened to the rear side of the linear module's front moving end. A support frame is fixed to the bottom of the bracket, and a slot seat is locked and fixed to the inner side of the bottom of the support frame. A first motor is locked and fixed to the middle of the bracket. An actuating structure is connected to the bottom output end of the first motor, and the actuating structure is disposed through the support frame and the inner side of the slot seat. At least three spraying structures of the same structure and size are installed at the bottom of the actuating structure to form a spray head group distributed in a straight line.

[0016] Preferably, the actuating structure includes a shaft connected to the bottom output end of the first motor. The bottom of the shaft is fixed to the middle of the first three-pronged rod. The three bottom ends of the first three-pronged rod are rotatably connected to the three top ends of the second three-pronged rod via a first connecting rod. The three bottom ends of the second three-pronged rod are rotatably connected to the three top ends of the third three-pronged rod via a second connecting rod. A rotating rod is provided on the middle side of the bottom of the third three-pronged rod. The rotating rod passes through and rotates inside the slider. A gear plate is coaxially fixed on the middle of the outer surface of the rotating rod. A plate frame is provided on the bottom side of the gear plate. The slider slides through and slides inside the middle of the support frame to provide stable rotation and vertical guiding support for the rotating rod and the gear plate. The plate frame is inserted and slides inside the slot seat, and the bottom of the plate frame is fastened to the nozzle assembly formed by the spraying structure.

[0017] Preferably, the top of the single-plate frame has protruding columns arranged on the middle side, and the protruding columns mesh with the gear plate for transmission. The part of the top of the single-plate frame located on the outer periphery of the protruding columns has a racetrack-like groove, and the bottom end of the rotating rod is inserted into and slides inside the racetrack-like groove.

[0018] Preferably, the spraying structure includes a carrier that is locked and fixed to the top side of the actuating structure. A second motor is locked and fixed to the left front part of the carrier, and a third motor is locked and fixed to the right rear part of the carrier. A first worm is connected to the front output end of the third motor. A worm gear sleeve is engaged and driven on the side of the first worm. The worm gear sleeve rotates through the middle of the bottom of the carrier, and a sleeve is integrally fixed to the bottom of the worm gear sleeve. A second worm is connected to the rear output end of the second motor. A worm gear rod is engaged and driven on the side of the second worm. The worm gear rod rotates through the middle of the worm gear sleeve and the sleeve, and a first bevel gear is integrally formed at the bottom end of the worm gear rod. A second bevel gear is engaged and driven on the lower left side of the first bevel gear. A rotating column is fixed through the middle of the second bevel gear, and the rotating column is rotatably connected to the left and right sides of the sleeve. A vertical rod is fixed to the middle of the outer surface of the rotating column, and a spray head is fixed to the bottom of the vertical rod. The bottom rear part of the spray head is connected to an external glue source end through a hose.

[0019] Preferably, the first bevel gear and the second bevel gear have the same structure and size, and the first worm gear and the second worm gear have the same structure and size, so as to ensure that the transmission ratio of the angle adjustment on both sides is consistent, which facilitates the control system to perform accurate angle calculation and control.

[0020] In summary, this application includes the following beneficial technical effects: 1. This application employs a combination of a three-pronged lever and a geared disc transmission mechanism with a racetrack-like trough to convert the uniform rotational motion of the first motor into the variable-speed linear reciprocating motion of the nozzle assembly. This mechanism does not rely on complex electronic control; it can automatically achieve the motion characteristics of the nozzle assembly running at high speed in the middle of the stroke and decelerating and turning back at both ends of the stroke through a purely mechanical structure. The transmission chain is short, the structure is compact, and the reliability is high. At the same time, each nozzle is equipped with an independent dual worm gear angle adjustment device, which can accurately control the horizontal azimuth angle and pitch angle of the nozzle respectively. The two adjustment methods do not interfere with each other and can be dynamically adjusted in coordination during the material spreading process to ensure that the spray strips formed by each nozzle achieve the best oblique overlap effect.

[0021] 2. In the manufacturing process of this application, a multi-nozzle structure with a half-width width and the combined motion of longitudinal fabric conveying are used to form spray strips that overlap obliquely on the fabric surface. After multiple passes, a thermal insulation layer with a non-homogeneous micro-layer structure with an inclined interface is constructed. When subjected to bending or tensile stress, the crack propagation of this micro-layer structure is continuously hindered and deflected by the inclined interface, thereby dispersing the stress to a larger area and improving the flexibility and peel resistance of the thermal insulation layer. In addition, by utilizing the mechanical characteristics of the nozzle assembly automatically decelerating at both ends of the stroke, and in conjunction with the synchronous adjustment of the flow rate, more slurry is deposited in the transverse end areas of the fabric to form a thermal insulation band with thickened edges. At the same time, through a staged low-temperature curing process, a cross-linking density gradient is formed in the thermal insulation layer from the outside to the inside, taking into account both the wear resistance of the outer surface and the flexibility of the inner layer.

[0022] 3. In terms of overall energy efficiency, this application organically integrates a mechanical speed-changing mechanism, an independently adjustable multi-nozzle array, and a staged curing process, achieving full-process optimization from slurry preparation and variable-density spreading to low-temperature curing. The nozzle group, arranged in a straight line and with a length half the width of the fabric, performs half-width reciprocating scanning, which not only reduces the requirements for the equipment's guiding span and driving power, but also effectively avoids defects such as cracking and pinholes caused by single-layer thick coating by constructing a thermal insulation layer through multiple thin-layer superposition, thus significantly improving the product yield and production efficiency. Attached Figure Description

[0023] Figure 1 This is a flowchart illustrating the manufacturing process of the thermal clothing in this application; Figure 2 This is a schematic diagram of the fabric-laying equipment used in the manufacturing process of the thermal clothing in this application; Figure 3 This is a schematic diagram of the structure of the coating mechanism in this application; Figure 4 This is a schematic diagram of the action structure of this application; Figure 5 This is a top view schematic diagram of the connection between the third trident, slider, and gear plate in this application; Figure 6 This is a schematic diagram of the spraying structure of this application; Figure 7 This application Figure 6 Left view of the structure after the nozzles have been removed; Figure 8 This application Figure 6 A schematic diagram of the main structure after removing the second motor, the third motor, and the nozzle.

[0024] Explanation of reference numerals in the attached drawings: 1. Crossbeam; 2. First support frame; 3. Second support frame; 4. Linear module; 5. Coating mechanism; 51. Support; 52. Bearing frame; 53. Slot seat; 54. First motor; 55. Action structure; 56. Spraying structure; 551. Shaft; 552. First tripod; 553. First connecting rod; 554. Second tripod; 555. Second connecting rod; 556. Third tripod; 557. Slider; 5 58. Gear plate; 559. Straight plate frame; 5591. Protruding column; 5592. Racetrack-like groove; 561. Carrier; 562. Second motor; 563. Third motor; 564. First worm; 565. Worm gear sleeve; 566. Sleeve; 567. Second worm; 568. Worm gear rod; 569. First bevel gear; 5610. Second bevel gear; 5611. Rotating column; 5612. Upright pole; 5613. Nozzle. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 -Appendix Figure 8 This application will be described in further detail below.

[0026] like Figure 2 As shown, this embodiment provides a material spreading device for a low-temperature curing molding process of thermal clothing, including a crossbeam 1. A first pad 2 and a second pad 3 are bolted to the left and right sides of the bottom of the crossbeam 1, respectively, to stably support the crossbeam 1 on the frames on both sides of the production line. A linear module 4 is longitudinally locked to the front side of the crossbeam 1. In this embodiment, the linear module 4 is a ball screw slide module driven by a servo motor. A coating mechanism 5 is locked to the front moving end (i.e., the slide) of the linear module 4, used to adjust the height of the coating mechanism 5. The rear bottom side of the coating mechanism 5 is connected to an external adhesive source supply system via a flexible hose. The external adhesive source includes a slurry storage tank and a precision metering pump, used to quantitatively deliver thermal insulation slurry to each nozzle of the coating mechanism 5.

[0027] like Figure 3As shown, the coating mechanism 5 includes a bracket 51 that is fastened to the front moving end of the linear module 4 at the rear. The bracket 51 is an L-shaped sheet metal welded part. A support frame 52 is fixed to the bottom horizontal side of the bracket 51 by screws. The support frame 52 is a frame structure with a hollow cavity. A slot seat 53 is locked and fixed to the bottom inner side of the support frame 52 by screws. The slot seat 53 has a straight guide groove machined inside. A first motor 54 is locked and fixed to the bottom horizontal surface of the bracket 51. The first motor 54 is a servo motor. The bottom output end of the first motor 54 is connected to an action structure 55. The main body of the action structure 55 is inserted through the hollow cavity of the support frame 52 and the guide groove of the slot seat 53. Five spraying structures 56 of the same structure and size are installed at the bottom of the action structure 55. They are arranged in a straight line at equal intervals to form a spray head group. The total lateral length of the spray head group is half of the maximum width of the fabric to be processed.

[0028] like Figure 4 and Figure 5 As shown, the actuating structure 55 includes a shaft 551 connected to the bottom output end of the first motor 54 via a coupling. The bottom of the shaft 551 is fixed to the middle of the first tripod 552. The first tripod 552 is a star-shaped part with three evenly distributed radial arms. Its three bottom ends are rotatably connected to the top three ends of the second tripod 554 via a first connecting rod 553. Similarly, the three bottom ends of the second tripod 554 are rotatably connected to the top three ends of the third tripod 556 via a second connecting rod 555. These three sets of tripods and connecting rods form a spatial parallel transmission chain, which is used to stably transmit the rotational power of the first motor 54 to the bottom. The third triangular rod 556 has a vertically extending rotating rod integrally formed on the bottom center side, which passes through and rotates through the internal center hole of the slider 557. The slider 557 is a rectangular block, and its two sides slide in cooperation with the guide rail surface on the inner center side of the support frame 52 to limit the rotating rod radially and axially. A toothed disc 558 is coaxially fixed in the middle of the outer surface of the rotating rod. A straight plate frame 559 is provided on the bottom side of the toothed disc 558. The straight plate frame 559 is a long strip plate, and its length direction is consistent with the arrangement direction of the spray head assembly. The straight plate frame 559 is inserted into the guide groove of the slot seat 53 and can slide smoothly in the lateral direction. The bottom of the straight plate frame 559 is fastened to the spray head assembly composed of 5 spraying structures 56 by screws.

[0029] Among them, multiple protrusions 5591 are arranged along the length of the top middle side of the straight plate frame 559. The spacing of the protrusions 5591 is adapted to the tooth pitch of the gear disk 558. The teeth of the gear disk 558 directly mesh with the protrusions 5591 to form a transmission pair similar to a gear and rack. The area on the top of the straight plate frame 559 located on the outer periphery of the protrusions 5591 is also machined with a racetrack-like groove 5592. The racetrack-like groove 5592 is an elongated through hole with semi-circular arcs at both ends and a parallel straight line in the middle. Its extension direction is parallel to the arrangement direction of the protrusions 5591. The bottom end of the rotating rod is inserted and slides inside the racetrack-like groove 5592. A roller or sliding bearing can be embedded in the bottom end of the rotating rod to reduce sliding friction.

[0030] When the actuating structure 55 is working, the first motor 54 drives the shaft 551 and the first three-pronged rod 552 to rotate, which in turn drives the third three-pronged rod 556 to rotate via the parallel connecting rod transmission chain. The third three-pronged rod 556 drives the coaxial geared disc 558 to rotate. The teeth of the geared disc 558 sequentially actuate the protrusions 5591 on the straight plate frame 559. Since the straight plate frame 559 is constrained by the lateral guidance of the slot seat 53, the rotational motion of the geared disc 558 is transformed into the rotational motion of the straight plate frame 559 and the entire nozzle assembly connected to it. The nozzle assembly moves in a straight line along the transverse direction. When the straight plate frame 559 moves to the end position and needs to retract, the contact action between the racetrack-like groove 5592 and the rotating rod causes the rotating rod to drive the toothed disc 558 to move to the other side of the protrusion 5591. During this movement, the straight plate frame 559 performs a decelerating retraction action, which makes the nozzle assembly move at a high speed per unit time in the middle of the stroke and at a slow speed at both ends of the stroke, thereby achieving a variable speed reciprocating motion with high speed in the middle and low speed at both ends.

[0031] like Figures 6 to 8 As shown, the spraying structure 56 includes a carrier 561 whose top side is locked to the bottom of a straight plate frame 559 by screws. The carrier 561 is a housing with an internal installation space. A second motor 562 is locked to the front left side of the carrier 561, and a third motor 563 is locked to the rear right side of the carrier 561. Both motors are micro stepper motors or servo motors. A first worm 564 is connected to the front output end of the third motor 563. The helical teeth of the first worm 564 mesh with the worm gear teeth machined on the outer circumference of the worm gear sleeve 565. The worm gear sleeve 565 rotates through a vertical hole in the middle of the bottom of the carrier 561, and its interior is a hollow structure. A sleeve 566 is integrally fixed to the bottom of the worm gear sleeve 565. The sleeve 566 is a fork-shaped part with bearing mounting holes on both sides. The second motor 562 has a second worm gear 567 connected to its rear output end. The helical teeth of the second worm gear 567 mesh with the worm gear teeth machined on the outer circumference of the worm gear post 568. The worm gear post 568 rotates through the central through hole of the worm gear sleeve post 565 and the central hole at the top of the sleeve 566, with its bottom extending into the internal cavity of the sleeve 566. A first bevel gear 569 is integrally formed thereon. A second bevel gear 5610 meshes with the lower left side of the first bevel gear 569. The two bevel gears have the same structure and size. A rotating shaft is fixed through the middle of the second bevel gear 5610. The column 5611 is rotatably connected to the mounting holes on the left and right sides of the sleeve 566 via bearings; the upright 5612 is fastened to the middle of the outer surface of the rotating column 5611, and the upright 5612 is a downwardly extending strip-shaped part, the bottom of which is fastened to the nozzle 5613 by threads or bayonet; the nozzle 5613 is a commercially available slit extrusion type or needle type precision nozzle, and its rear bottom side is provided with a feeding interface, which is connected to the external glue source end through a hose. All hoses are equipped with sufficient length margin to accommodate the reciprocating motion of the nozzle assembly and the drag chain movement during angle adjustment.

[0032] The angle adjustment principle of the spraying structure 56 is as follows: the third motor 563 drives the first worm 564 to rotate, which in turn drives the worm gear sleeve 565 to rotate around the vertical axis. The worm gear sleeve 565 drives the sleeve 566 and the nozzle assembly mounted on it to rotate as a whole, thereby adjusting the azimuth angle of the nozzle 5613 in the horizontal plane. The second motor 562 drives the second worm 567 to rotate, which in turn drives the worm gear rod 568 to rotate around its own axis. The first bevel gear 569 at the bottom of the worm gear rod 568 drives the second bevel gear 5610 to rotate. This rotation is achieved through the rotating column 5611 and the upright rod 5612, which drive the nozzle 5613 to swing around the horizontal axis, thereby adjusting the pitch angle of the nozzle 5613. This is used to adjust the incident angle of the slurry sprayed onto the fabric surface to adapt to the requirements of the fabric spreading pattern at different speeds. These two angle adjustment methods are independent of each other and can be dynamically adjusted in combination as needed during the spreading process to ensure that the sprayed strips formed by each nozzle achieve the best oblique overlap effect.

[0033] It should be noted that in this embodiment, the first worm 564 and the second worm 567 adopt the same structural parameters and dimensions, and their module, number of teeth, and helix angle are all the same. At the same time, the first bevel gear 569 and the second bevel gear 5610 also have the same structure and size, so that the second motor 562 and the third motor 563 can drive the nozzle 5613 to achieve proportional pitch and azimuth angle adjustment under the same pulse control. This facilitates the control system to uniformly calibrate the angle displacement, avoids angle calculation errors caused by transmission ratio differences, and thus ensures the consistency and accuracy of attitude adjustment of the multi-nozzle array during collaborative spraying.

[0034] Combination Figure 1 The specific steps for implementing the process are as follows: Step 1: Select nylon taslon fabric, cut it into pieces according to the predetermined garment pattern, fix it on the conveyor chain plate, and start the infrared heating plate to preheat the pieces evenly to 38℃.

[0035] Step 2: Add water-based polyurethane prepolymer, paraffin hydrocarbon phase change microcapsules (phase change temperature 28℃), hollow glass microspheres and water-based crosslinking agent into a vacuum mixing vessel at a mass ratio of 100:20:15:5, stir and degas at -0.09MPa for 30 minutes to obtain a thermal insulation slurry with a viscosity of 5500mPa·s, and transport it to the adhesive source storage tank.

[0036] Step 3: Set the longitudinal conveying speed to 0.8 m / min, start the material spreading equipment, and the first motor 54 runs at a constant speed. Through the action structure 55, it drives 5 nozzles to perform transverse reciprocating scanning at a frequency of about 0.5 Hz. Its stroke is half the width of the fabric. Utilizing the mechanical characteristics of the action structure 55 itself, the nozzle group automatically moves at high speed in the middle of the stroke and automatically decelerates and turns back at both ends of the stroke. At the same time, each nozzle sprays at a base flow rate of 150 g / min. When the nozzle group automatically runs to the low-speed zone at both ends, the real-time extrusion flow rate of each nozzle is synchronously adjusted by the pre-set program of the control system, increasing it by about 40%. Combined with the longer residence time brought about by the low-speed movement, the amount of slurry deposited in the two end areas is significantly increased. After 10 complete reciprocating cycles, a wet insulation layer with an average thickness of about 1.2 mm is formed on the surface of the cut piece, and the thickness at both ends is greater than that in the middle.

[0037] Step 4: Place the cut pieces into a temperature and humidity alternating curing chamber. In the first stage, cure for 12 minutes at 50℃ and 75%RH. In the second stage, cure for 25 minutes at 65℃ and 55%RH to completely cure the insulation layer into a porous flexible layer with cross-linking gradient.

[0038] Step 5: Sew and assemble the cured cut pieces according to the production process to make the final thermal garment.

[0039] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A process for manufacturing thermal clothing using low-temperature curing molding, characterized in that, Includes the following steps: S1. Fabric pretreatment: Fix the garment fabric pieces onto a movable forming mold and preheat the fabric pieces to a temperature of 30-45℃. S2. Preparation of low-temperature curing thermal insulation slurry: Mix water-based polyurethane prepolymer, phase change microcapsules, hollow glass microspheres and crosslinking agent in a mass ratio of 100:15-30:10-20:3-8, and stir and degas under vacuum to obtain a thermal insulation slurry with a viscosity of 3000-8000 mPa·s. S3. Variable Density Spreading: The fabric piece is conveyed longitudinally at a constant speed, while a spreading device performs multiple transverse reciprocating sprays on the surface of the moving fabric piece. The spreading device has a linear array of nozzles with a transverse length equal to half the width of the fabric piece, and at least three nozzles are arranged along its length. During one complete transverse reciprocating stroke, the sprayed strips formed by each nozzle on the fabric piece surface overlap obliquely, and through multiple layers, form a wet insulation layer with a thickness of 0.5-3mm. The transverse movement of the nozzle array is a variable-speed reciprocating motion, resulting in a high speed in the middle of the stroke and a low speed at both ends, thus forming a thicker insulation strip at the transverse ends of the fabric piece than in the middle section. S4. Low-temperature curing: The fabric piece with the wet insulation layer is placed in an environment of 45-70℃ and 50-80% relative humidity for 20-60 minutes to cure the water-based polyurethane prepolymer through cross-linking and curing, and to fix the phase change microcapsules and hollow glass microspheres, forming a porous flexible insulation layer with a heterogeneous microlayer structure. The low-temperature curing adopts a staged temperature and humidity control: the first stage is maintained at 45-55℃ and 70-80% relative humidity for 10-15 minutes; the second stage is maintained at 60-70℃ and 50-60% relative humidity for 10-45 minutes. Through the two-stage temperature and humidity adjustment, a cross-linking density gradient is formed from the outer surface to the inner surface of the insulation layer, with the cross-linking density on the outer surface being higher than that on the inner surface. S5. Piece splicing: Multiple cured fabric pieces with thermal insulation layers are spliced ​​together according to the garment structure to obtain the thermal garment.

2. The process for preparing thermal clothing by low-temperature curing according to claim 1, characterized in that, In step S3, when each nozzle of the nozzle group performs oblique overlapping spraying, the slurry strips sprayed by adjacent nozzles come into contact and flow and fuse before curing. After curing in step S4, a heat-insulating layer with an inclined interface heterogeneous micro-layer structure is formed.

3. The process for preparing thermal clothing by low-temperature curing according to claim 1, characterized in that, In step S3, the material spreading equipment includes a crossbeam (1), and a first pad (2) and a second pad (3) are locked and fixed on the left and right sides of the bottom of the crossbeam (1), respectively. A linear module (4) is locked and fixed on the front side of the crossbeam (1), and a coating mechanism (5) is locked and fixed on the front moving end of the linear module (4). The bottom side of the rear part of the coating mechanism (5) is connected to the external glue source end through a hose.

4. The process for preparing thermal clothing by low-temperature curing according to claim 3, characterized in that, The coating mechanism (5) includes a bracket (51) that is fastened to the front moving end of the linear module (4) at the rear. A support frame (52) is fixed at the bottom of the bracket (51). A slot seat (53) is locked and fixed on the inner side of the bottom of the support frame (52). A first motor (54) is locked and fixed in the middle of the bracket (51). An action structure (55) is connected to the bottom output end of the first motor (54). The action structure (55) is disposed through the support frame (52) and the slot seat (53). At least three spraying structures (56) with the same structure and size are installed at the bottom of the action structure (55) to form a spray head group.

5. The process for preparing thermal clothing by low-temperature curing according to claim 4, characterized in that, The actuating structure (55) includes a shaft (551) connected to the bottom output end of the first motor (54). The bottom of the shaft (551) is fixed to the middle of the first tripod (552). The three bottom ends of the first tripod (552) are rotatably connected to the three top ends of the second tripod (554) via a first connecting rod (553). The three bottom ends of the second tripod (554) are rotatably connected to the three top ends of the third tripod (556) via a second connecting rod (555). A rotating rod is provided at the bottom center of the third triangular rod (556). The rotating rod passes through and rotates inside the slider (557). A gear plate (558) is coaxially fixed at the center of the outer surface of the rotating rod. A plate frame (559) is provided at the bottom of the gear plate (558). The slider (557) slides through and slides inside the support frame (52). The plate frame (559) is inserted and slides inside the slot seat (53). The bottom of the plate frame (559) is fastened to the nozzle assembly formed by the spraying structure (56).

6. The process for preparing thermal clothing by low-temperature curing according to claim 5, characterized in that, The top of the single-plate frame (559) has protruding columns (5591) arranged in the middle, and the protruding columns (5591) mesh with the gear plate (558) for transmission. The top of the single-plate frame (559) is provided with a racetrack-like groove (5592) on the outer periphery of the protruding columns (5591), and the bottom end of the rotating rod is inserted and slidably inserted into the racetrack-like groove (5592).

7. The process for preparing thermal clothing by low-temperature curing according to claim 4, characterized in that, The spraying structure (56) includes a carrier (561) that is locked and fixed to the top side of the actuating structure (55). A second motor (562) is locked and fixed to the left front part of the carrier (561), and a third motor (563) is locked and fixed to the right rear part of the carrier (561). A first worm (564) is connected to the front output end of the third motor (563). A worm gear sleeve (565) is engaged and driven on the side of the first worm (564). The worm gear sleeve (565) rotates through the middle of the bottom of the carrier (561), and a sleeve (566) is integrally fixed to the bottom of the worm gear sleeve (565). A second worm (567) is connected to the rear output end of the second motor (562). The second worm (567) is engaged and driven on the side of the second worm. The transmission is provided by a worm gear rod (568), which rotates through the middle of the worm gear sleeve (565) and the sleeve (566). The bottom end of the worm gear rod (568) is integrally formed with a first bevel gear (569). The lower left side of the first bevel gear (569) meshes with a second bevel gear (5610). The middle of the second bevel gear (5610) is fixed with a rotating column (5611), which is rotatably connected to the left and right sides of the sleeve (566). The middle of the outer surface of the rotating column (5611) is fixed with a vertical rod (5612), and the bottom of the vertical rod (5612) is fixed with a nozzle (5613). The bottom rear part of the nozzle (5613) is connected to an external glue source end through a hose.

8. The process for preparing thermal clothing by low-temperature curing according to claim 7, characterized in that, The first bevel gear (569) and the second bevel gear (5610) have the same structure and size, and the first worm (564) and the second worm (567) have the same structure and size.

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